Subject: 3.5m Night Log 20230717
From: ajt@apo.nmsu.edu
Date: Tue, 18 Jul 2023 11:36:10 +0000 (UTC)
                      Apache Point Observatory
                      3.5m Telescope Night Log
                      Monday, July 17, 2023
PROG  PI ASTRONOMER      OBSERVER(S)
--------------------------------------------------------------------
GS01  D.Crenshaw        D.Crenshaw & Class
CU02  A.Kowalski        C.Canas,J.Libby-Roberts,V.Reji,E.Fitzmaurice
                         ON-SKY
PROG  INSTRUMENT     START   FINISH
--------------------------------------------------------------------
GS01  KOSMOS         21:57   23:06
CU02  ARCTIC         23:14   02:06
   PROG       SCHEDULED      WEATH     EQUIP     OBS     NOT USED
 I/ROW/DTN  START  FINISH   D    B    D    B    D    B    D    B
-----------------------------------------------------------------
GS01/O      20:20  23:10   1.3  0.4   0    0   1.1  0.0   0    0
CU02/R      23:10  05:59   3.9   0    0    0   2.9  0.0   0    0
note: scheduled times listed include instrument change time
              ------------- ACTIVITY LOG --------------
Observing Specialist: A.Townsend,C.Gray
During the tour with the class this afternoon, Candace noticed that the rotator was a little off and zeroed it (+1.372).
We had too-high 1-micron dust counts at the start of the night but the GS01 class got on sky for about an hour before we switched programs. We were able to stay on sky for about three more hours before we had to close up again when the dust counts came back up. We gave up at 04:00 when the 1-micron dust counts were leveling off above the closure limit.
DIS temps:
18:48 197, 190
21:53 203, 189
04:44 192, 185
05:05 188, 185
                    ------- FAILURE LOG -------
              FAILURE MODE     TIME
PROG   INSTR     TI/SHU    START  FINISH  DESCRIPTION
----------------------------------------------------------------------
            ---------------- FOCUS LOG ---------------
Time  Instrument  Focus     Az  El  Temp Strc Prim  Sec  Air  filt  FWHM
--------------------------------------------------------------------------
 22:07 khigh   450( 1491) -162  39  20.5 21.8 22.6 21.6 20.9   --  1.50
 23:41 arctic   382( 1412) 101  30  20.4 20.3 21.1 20.2 20.1   SDSS_i  1.62
               ------------- WEATHER LOG ----------------
                                   Wind                      Precip.or
     Time   Temp F Dewp F  MPH  Direction    Dust    Sky    Conditions
    ------------------------------------------------------------------
     16:00    72    42      8    94    (E)   2944   cloudy     none
     17:00    72    41      8   117  (ESE)   3291   cloudy     dust
     18:00    74    42      7   117  (ESE)   3440   cloudy     dust
     19:00    73    43      9   136   (SE)   4105   cloudy     dust
     20:00    71    43     15   143   (SE)   4259 mstly clr    dust
     21:00    71    41     15   153  (SSE)   4153    clear     dust
     22:00    69    38     18   137   (SE)   3584    clear     dust
     23:00    68    34     20   132   (SE)   2982    clear     none
     00:00    68    34     18   129   (SE)   2999    clear     none
     01:00    67    35     12   131   (SE)   3640 mstly clr    dust
     02:00    66    35     12   153  (SSE)   4439    clear     dust
     03:00    67    34     14   148  (SSE)   4339    clear     dust
     04:00    67    35     10   183    (S)   3603    clear     dust
     05:00    67    37      8   189    (S)   4982    clear     dust
     Note: the wind was coming from the azimuth listed.
     The convention used is north=0 degrees, east=90 degrees.
     The dust count is particles > 1u per 0.1 cubic feet.
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